Monthly Archives - January 2025

تعریف لوله مسی
27Jan

Definition of Copper Pipe

1. Definition of Copper Pipe • Definition: A copper pipe is a type of pipe made from copper, which is used in industrial and domestic applications due to its physical and chemical properties. • Features: o High resistance to corrosion o Excellent heat transfer o Long durability o Flexibility for easy installation o Hygienic properties and reduction of bacterial growth in drinking water 2. Technical Specifications of Copper Pipes • Raw Materials: High-purity copper (99.9%). • Dimensions and Standards: o Outside diameter: 4 to 100 mm o Wall thickness: 0.5 to 5...

By Articles, Technichal Points, Training
Read more...
CFM
20Jan

Definition of CFM

1. Definition of CFM

What is CFM? Basic explanations about CFM and its importance in mechanical engineering and refrigeration systems.

2. Concept of Flow Rate

What is meant by flow rate? Description of flow rate and its relationship to the amount of air passing through a unit of time.

3. Applications of CFM

Use of CFM in different devices: Examples of devices (fan-coils, air handling units, duct split systems) and their airflow rates.

4. What does CFM stand for?

Explanation of the abbreviation: Definition of CFM as "Cubic Feet Per Minute".

5....

By Articles, Technichal Points, Training
Read more...
تأثیر عیوب خم 180 درجه (استاندارد، چین‌خوردگی و دوپهــــن‌شدگی) در ناحیه یو بر عملکرد کویل فین-تیوب
18Jan

Impact of 180° U-Bend Defects on the Performance of Fin-Tube Coils

<p>

Overview

In fin-tube heat exchangers, the 180° U-bend region plays a critical role in fluid distribution, heat transfer, and pressure drop. When the bend is manufactured correctly—with proper curvature, constant internal diameter, and smooth internal surface—the flow field and thermal performance remain close to design values. However, two common manufacturing defects in the U-bend can severely degrade performance: local corrugation and local flattening. This document provides a technical assessment of all three conditions.

1....

By Articles, Technichal Points, Training, ,
Read more...
روش‌های جلوگیری از خوردگی در کویل‌های فین-تیوب
18Jan

Corrosion in Fin–Tube Coils and Methods for Preventing It

Fin–tube coils, which typically combine aluminum fins with copper tubes, are widely used in air-conditioning and HVAC systems. Corrosion in these components leads to reduced heat-transfer performance, efficiency loss, leakage, and shortened service life. The following sections present practical, preventive engineering methods for protecting these coils.

Material Selection and Proper Design

Corrosion-Resistant Alloys

Selecting aluminum and copper alloys with inherently high corrosion resistance—such as surface-treated aluminum alloys or copper alloys with controlled alloying elements—forms the foundational approach to durability...

By Articles, Technichal Points, Training, ,
Read more...
سایزینگ کلکتور ورودی و خروجی کویل فین-تیوب آبی — راهنمای فنی و دقیق
18Jan

Technical Guide for Sizing Inlet and Outlet Manifolds of Water-Fin–Tube Coils

General Principles

Primary Objective:To ensure uniform water distribution across all tube circuits, minimize pressure drop, and prevent cavitation and noise. Key Parameters:Total system mass flow rate m˙\dot{m}m˙, number of tube rows NtN_tNt​, internal tube diameter dtd_tdt​, effective coil length LLL, desired velocity in each tube, and allowable total pressure drop in the manifolds.

Fundamental Calculations

1. Determining Total Flow Rate

Use the coil heat load QQQ and water temperature difference ΔT\Delta TΔT: m˙=QcpΔT\dot{m} = \frac{Q}{c_p \Delta T}m˙=cp​ΔTQ​ where cpc_pcp​, the specific...

By Articles, Technichal Points, Training, , , ,
Read more...
Different Types of Fin Tubes
12Jan

Different Types of Fin Tubes Based on Design

There are various types of fin tubes available for heat transfer applications, each uniquely designed with specific dependencies. Each type of fin tube has its advantages and disadvantages in specific applications to be used in the most suitable conditions. Different Types of Fin Tubes Based on Type of Fin Fin Plate Wrap-on Fin Extruded Fin Fin Plates The plate heat exchanger is a type of heat exchanger that uses plates to transfer heat between fluids. In most cases, the plate fin is categorized as a compact...

By Articles, Technichal Points, Training,
Read more...
تعریف سابکولینگ و سوپرهیت Subcooling and Super heat Definition
05Jan

Subcooling and Superheating Definition

Definition of Subcooling Subcooling refers to a liquid whose temperature is lower than its saturation point. Process of Subcooling Subcooling and condensation occur in the condenser. The use of subcooling is for transferring refrigerant from the condenser to the thermostatic expansion valve in liquid form. Mechanism of Refrigeration Systems The refrigerant absorbs heat and releases it to the environment after leaving the compressor and reaching the condenser. The temperature decreases in the condenser, and the refrigerant transitions to the liquid phase. Advantages of Subcooling Increased...

By Articles, Technichal Points, Training,
Read more...